import java.awt.*;
 import java.awt.event.*;
 import java.awt.geom.*;
 import java.util.*;
 import javax.swing.*;

 /**
    Shows an animated bouncing ball.
 */
 public class BounceThread
 {
    public static void main(String[] args)
    {
       JFrame frame = new BounceFrame();
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.setVisible(true);
    }
 }

 /**
    A runnable that animates a bouncing ball.
 */
 class BallRunnable implements Runnable
 {
    /**
       Constructs the runnable.
       @aBall the ball to bounce
       @aPanel the component in which the ball bounces
    */
    public BallRunnable(Ball aBall, Component aComponent)
    {
       ball = aBall;
       component = aComponent;
    }

    public void run()
    {
       try
       {
          for (int i = 1; i <= STEPS; i++)
          {
             ball.move(component.getBounds());
             component.repaint();
             Thread.sleep(DELAY);
          }
       }
       catch (InterruptedException e)
       {
       }
    }

    private Ball ball;
    private Component component;
    public static final int STEPS = 1000;
    public static final int DELAY = 5;
 }

 /**
    A ball that moves and bounces off the edges of a
    rectangle
 */
 class Ball
 {
    /**
       Moves the ball to the next position, reversing direction
       if it hits one of the edges
    */
    public void move(Rectangle2D bounds)
    {
       x += dx;
       y += dy;
       if (x < bounds.getMinX())
       {
          x = bounds.getMinX();
          dx = -dx;
       }
       if (x + XSIZE >= bounds.getMaxX())
       {
          x = bounds.getMaxX() - XSIZE;
          dx = -dx;
       }
       if (y < bounds.getMinY())
       {
          y = bounds.getMinY();
          dy = -dy;
       }
       if (y + YSIZE >= bounds.getMaxY())
       {
          y = bounds.getMaxY() - YSIZE;
          dy = -dy;
       }
    }

    /**
       Gets the shape of the ball at its current position.
    */
    public Ellipse2D getShape()
    {
       return new Ellipse2D.Double(x, y, XSIZE, YSIZE);
    }

    private static final int XSIZE = 15;
    private static final int YSIZE = 15;
    private double x = 0;
    private double y = 0;
    private double dx = 1;
    private double dy = 1;
 }

 /**
    The panel that draws the balls.
 */
 class BallPanel extends JPanel
 {
    /**
       Add a ball to the panel.
       @param b the ball to add
    */
    public void add(Ball b)
    {
       balls.add(b);
    }

    public void paintComponent(Graphics g)
    {
       super.paintComponent(g);
       Graphics2D g2 = (Graphics2D) g;
       for (Ball b : balls)
       {
          g2.fill(b.getShape());
       }
    }

    private ArrayList<Ball> balls = new ArrayList<Ball>();
 }

 /**
    The frame with panel and buttons.
 */
 class BounceFrame extends JFrame
 {
    /**
       Constructs the frame with the panel for showing the
       bouncing ball and Start and Close buttons
    */
    public BounceFrame()
    {
       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
       setTitle("BounceThread");
//this.addKeyListener(new KeyListener() {
//
//            public void keyTyped(KeyEvent e) {
//                //throw new UnsupportedOperationException("Not supported yet.");
//                if(e.getKeyChar()=='A' || e.getKeyChar()=='a')
//                {
//                    System.err.println("you pressed A");
//                }
//            }
//
//            public void keyPressed(KeyEvent e) {
//                //throw new UnsupportedOperationException("Not supported yet.");
//
//            }
//
//            public void keyReleased(KeyEvent e) {
//                //throw new UnsupportedOperationException("Not supported yet.");
//            }
//        });

       panel = new BallPanel();
       add(panel, BorderLayout.CENTER);
       JPanel buttonPanel = new JPanel();
       addButton(buttonPanel, "Start",
          new ActionListener()
          {
             public void actionPerformed(ActionEvent event)
             {
                addBall();
             }
          });

       addButton(buttonPanel, "Close",
          new ActionListener()
          {
             public void actionPerformed(ActionEvent event)
             {
                System.exit(0);
             }
          });
       addButton(buttonPanel,"Connect",
           new ActionListener()
       {
           public void actionPerformed(ActionEvent event)
           {
                //server find
           }
       });

       add(buttonPanel, BorderLayout.SOUTH);
    }

    /**
       Adds a button to a container.
       @param c the container
       @param title the button title
       @param listener the action listener for the button
    */
    public void addButton(Container c, String title, ActionListener listener)
    {
       JButton button = new JButton(title);
       c.add(button);
       button.addActionListener(listener);
    }

    /**
       Adds a bouncing ball to the canvas and starts a thread
       to make it bounce
    */
    public void addBall()
    {
       Ball b = new Ball();
       panel.add(b);
       Runnable r = new BallRunnable(b, panel);
       Thread t = new Thread(r);
       t.start();
    }

    private BallPanel panel;
    public static final int DEFAULT_WIDTH = 450;
    public static final int DEFAULT_HEIGHT = 350;
    public static final int STEPS = 1000;
    public static final int DELAY = 3;
 }

